英文關鍵字
adult
air
allergy
arms
blue
caucasian
ceiling
changing
clean
cleaning
color
condition
conditioning
cooling
dirty
duct
efficient
energy
environment
filter
furnace
hands
heating
home
house
hvac
indoor
interior
maintenance
male
man
mature
person
preventive
quality
removed
replaced
replacement
replacing
residential
small
square
system
technician
vent
ventilating
ventilation
wall
white